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柔性直流馈入下交流输电线路单端故障测距分析
引用本文:余锐,肖超,陈愚,欧阳金鑫,熊俊,熊小伏.柔性直流馈入下交流输电线路单端故障测距分析[J].重庆大学学报(自然科学版),2017,40(9):47-56.
作者姓名:余锐  肖超  陈愚  欧阳金鑫  熊俊  熊小伏
作者单位:1. 国家电网公司西南分部,成都,610041;2. 重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆,400044
基金项目:国家自然科学基金资助项目(51407017);国家电网公司科技项目资助(XNFB-201605-FW-07);国家重点研发计划智能电网技术与装备重点专项(2016YFB0900604)。
摘    要:柔性直流输电具有不同于交流输电和常规直流输电的运行原理和特性,随着柔性直流输电技术的应用,交流电力系统的故障特征可能发生显著变化,基于传统交流系统暂态故障特征量的故障测距面临挑战.为此,基于柔性直流输电的运行原理,分析了柔直交流侧故障时换流器的运行特性,推导了在换流器保护未启动、限流以及闭锁条件下柔直交流侧短路电流解析式,分析比较了柔直不同暂态运行状态下对输电线路单端故障测距的影响规律.结果表明,柔直馈入下交流输电线路单端故障测距受换流器交流侧电压跌落系数和换流器无功功率指令的影响,通过PSCAD/EMTDC仿真验证了理论分析的正确性.

关 键 词:柔性直流输电  单端故障测距  暂态特性  短路故障  限流保护
收稿时间:2016/11/15 0:00:00

Performance analysis of single-terminal fault location for transmission lines in an HVDC/AC interconnected power system
YU Rui,XIAO Chao,CHEN Yu,OUYANG Jinxin,XIONG Jun and XIONG Xiaofu.Performance analysis of single-terminal fault location for transmission lines in an HVDC/AC interconnected power system[J].Journal of Chongqing University(Natural Science Edition),2017,40(9):47-56.
Authors:YU Rui  XIAO Chao  CHEN Yu  OUYANG Jinxin  XIONG Jun and XIONG Xiaofu
Institution:State Grid Southwest Division, Chengdu 610041, P. R. China,State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, P. R. China,State Grid Southwest Division, Chengdu 610041, P. R. China,State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, P. R. China,State Grid Southwest Division, Chengdu 610041, P. R. China and State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, P. R. China
Abstract:The operation principle and characteristics of flexible high voltage direct current (HVDC) is different from conventional AC and DC transmission. With the application of flexible HVDC technology, the fault characteristics of AC power system may change significantly, and the fault location algorithms based on conventional AC power system face challenges. Therefore, based on the operating principle of flexible HVDC, the operation characteristics of converter was analyzed when flexible HVDC/AC side has fault. The analytic expression of short-circuit current in AC side was derived with converter unprotected, current limited and converter blocked. The influencing rules of different transient operating conditions on the performance of single-terminal fault location for transmission lines were analyzed. It is concluded that the performance of single-terminal fault location for transmission lines in an HVDC/AC interconnected power system is influenced by the converter-side voltage dip coefficient and the referenced reactive power of the converter. And the correctness of theoretical analysis is verified by PSCAD/EMTDC simulation.
Keywords:flexible HVDC  single-terminal fault location  transient characteristic  short circuit failure  current-limiting protection
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